Properties Editor : Scene : Color Management
The color management is in the properties panel. If you don't know where the properties panel is, its over here:
 

Now, go to the scene panel, its the third one:


over here you will find colour management


If its closed, open it up by pressing the arrow


 if you still can't find it please post your .blend file over here
http://blend-exchange.giantcowfilms.com/